Have any chatbots fooled the judges and won the Loebner Prize Gold medal yet?
The 2016 finals haven't started yet, they will start on Saturday, 17 September 2016. 

In the 2015 finals or before that, nobody won the Gold Medal or the Silver Medal. 
The most up-to-date data can be found here, where we can find both the results from 2015 and the timeline of the 2016 contest.